Abstracting pointer arithmetic

[Richard Kenner]

    So with the clarification that my suggestion was only to apply for
    machines with exotic pointer aritmetic (say, #define EXOTIC_POINTERS
    in the target description), was my suggestion reasonable?

You don't need that #define since the Pmode define should be good enough.

    Or would something at the tree level still make more sense?

I don't think it would be enough due to reload issues and there's
*probably* no point in doing it at both levels.